两种钢在不同冲击功下的冲击腐蚀磨损性能与机制  

Corrosive-wear Performance and Mechanisms of Two Steels at Different Impact Energies

作　　者：王兰[1] 邢文静[1] 丁厚福[1] 杜晓东[1] 郑玉贵[2] 

机构地区：[1]合肥工业大学材料科学与工程学院,安徽合肥230009 [2]中国科学院金属研究所材料环境腐蚀试验研究中心,辽宁沈阳110016

出　　处：《物理测试》2007年第5期1-5,8,共6页Physics Examination and Testing

基　　金：教育部博士点基金资助项目(040309B2);安徽省自然科学基金资助项目(00046401);教育部重点科研基金资助项目(01104)

摘　　要：运用失重法、电化学测试和表面形貌观察,对低碳高合金钢和高锰钢湿磨衬板在酸性介质中的腐蚀、冲击腐蚀磨损性能与机制进行研究。结果表明:低碳高合金钢的腐蚀电流密度比高锰钢的小一个数量级,低碳高合金钢有自钝化倾向,而高锰钢则一直处于活性溶解状态,而且其耐腐蚀随时间的延长进一步恶化;随着冲击功增大,两种钢磨损失重呈不同程度的增大;在2.0 J冲击功下,两种钢的磨损失重相差不大;2.7 J与3.5 J时低碳高合金钢的磨损失重明显较小。2.0 J冲击功下,低碳高合金钢的磨损机制主要为显微切削,高锰钢主要为挤出硬化棱的疲劳剥落和腐蚀磨损;2.7 J冲击功下,低碳高合金钢主要为挤出硬化棱的剥落,高锰钢主要为块状腐蚀剥落;3.5 J冲击功下,低碳高合金钢主要为硬化层的疲劳剥落,高锰钢主要为较深层的大块疲劳剥落。The corrosive-wear performances in acidic solution and it＇s mechanisms of a low carbon high alloyed steel and a high manganese steel as mill liner, were investigated through weight loss, electrochemistry and surface morphology observation. The result showed that the corrosion current density of the former was one order smaller than that of the latter. The former showed the self-passivation tendency especially after 16h in acidic solution of pH 3.5, while the latter exhibited active dissolution and weak corrosion resistance. The corrosiye-wear weight losses of both steels increased with increasing impact energy. At impact energy of 2.0 J, the two steels behaved similarly, but at the impact energy of 2.7 J and 3.5 J, the former showed much better corrosive wear resistance. At 2.0 J, the failure mechanism was mainly micro-cutting for the former and was fatigue spalling of extruded hardened edge as well as corrosive wear for the latter. At 3.5 J, the main failure mechanisms were fatigue spalling of hardened edge for the former ,and was massive fatigue spalling and heavy corrosive wear for the latter.

关 键 词：冲击腐蚀磨损 冲击功 磨损机制 耐磨钢 极化曲线 

分 类 号：TG172[金属学及工艺—金属表面处理]